Gas tungsten arc (GTA) weldability of rolled CoCrFeMnNi high-entropy alloys (HEAs) was conducted using stainless steel (STS) 308L and HEA fillers. Microstructure and mechanical properties of the welds were examined to determine GTA weldability of the rolled HEA. The welds had no macro-defects, and component behaviour between base metal (BM) and weld metal (WM) showed significant differences in the weld using the STS 308L filler. Macro-segregation of Fe components was confirmed in the central region in the WM using the STS 308L filler. Because the columnar grain sizes of all the WMs were larger than those of the rolled HEA BM irrespective of the filler metals, the tensile properties of the GTA welds were lower than those of the rolled HEA BM, and the tensile fracture occurred in the centreline of each weld. In particular, the tensile properties of the weld using the STS 308L filler deteriorated more than those of the HEA weld. This was induced by the formation of macro-segregation and severe martensite transformation in the centreline of WM. To enhance the weldability of the rolled HEA, the formation of macro-segregation and coarse grains in the WM of GTA welds must be prevented.

中文翻译：

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使用各种填充金属的轧制高熵合金的GTA可焊性

使用不锈钢（STS）308L和HEA填料进行轧制CoCrFeMnNi高熵合金（HEAs）的钨极电弧（GTA）焊接性。检查了焊缝的微观结构和机械性能，以确定轧制HEA的GTA可焊性。焊缝没有宏观缺陷，使用STS 308L填料时，母材（BM）和焊缝金属（WM）之间的成分行为显示出显着差异。使用STS 308L填料，在WM的中心区域确认了Fe组分的宏观偏析。由于所有WM的柱状晶粒尺寸均大于轧制HEA BM的柱状晶粒，而与填充金属无关，因此GTA焊缝的拉伸性能低于轧制HEA BM的拉伸性能，并且拉伸断裂发生在焊缝的中心线每个焊缝。尤其是，与HEA焊缝相比，使用STS 308L填料的焊缝的拉伸性能下降得更多。这是由WM中心线的宏观偏析和严重的马氏体转变引起的。为了提高轧制的HEA的可焊性，必须防止在GTA焊缝的WM中形成宏观偏析和粗大晶粒。